Mikedin
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Technically that’s correct but when you feed Co2 into a room it needs to be sealed, one because you’ll otherwise be wasting Co2 but it has to be a sealed room (for burners etc, the little Co2 bags people hang seem worthless to me but idk lol)I'm not dissatisfied with how things have gone with my negative pressure, and I have no plans to change it. Other than to steal your pantyhose trick. But it is a subject that vexed me from the start. I mean either way you are taking CO2 laden air and placing it in the tent. And if you use a CO2 tank to bolster the level around the plant(s) positive pressure might be better since negative pressure would just exhaust more CO2 into the room and away from the plant(s).
But also when you introduce Co2 artificially you need to be very careful you’re not leaking that Co2 into your home potentially poisoning you … so in a Co2 addition application you’d have 0 pressure just a sealed room circulating normally they use a mini split, a heater, dehu as well as a humidifier to adjust VPD and Co2 concentrations in check without utilizing any external environment it’s all self contained, I believe they intermittently vent outdoors as well but I’ve never dug that deep past the potential Co2 poisioning and having your family in the home. Diddnt seem worth the risk to me
Also you won’t want positive pressure if you don’t want the house to reek like weed lol